内蒙古温带草地土壤有机碳组分含量和分解速率的空间格局及其影响因素

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陈颖洁¹^,², 房凯²^,³^,^*(

), 秦书琪², 郭彦军¹^,⁴, 杨元合²^,⁵

Spatial patterns and determinants of soil organic carbon component contents and decomposition rate in temperate grasslands of Nei Mongol, China

CHEN Ying-Jie¹^,², FANG Kai²^,³^,^*(

), QIN Shu-Qi², GUO Yan-Jun¹^,⁴, YANG Yuan-He²^,⁵

图5. 气候、土壤、植物和矿物变量对内蒙古温带草地土壤有机碳含量(A)、碳组分含量(B-D)和碳分解速率(E)影响的相对重要性。土壤有机碳、大团聚体碳、微团聚体碳、粉粒黏粒碳含量和有机碳标准化的碳分解速率数据经过了lg转化。AGB, 地上生物量; AI, 干旱指数; Ca_Exch, 交换性钙含量; Clay + silt, 黏粒和粉粒含量; Fe_o + Al_o, 弱结晶态铁铝氧化物含量; MAP, 年降水量; MAT, 年平均气温。

Fig. 5. Relative effects of climatic, edaphic, plant and mineral variables on soil organic carbon (C) content (A), aggregate C fractions content (B-D), and C decomposition rate (E) in temperate grasslands of Nei Mongol. Soil organic C, macroaggregate C, microaggregate C, silt and clay C contents, and C decomposition rate standardized by SOC are lg transformed. AGB, aboveground biomass; AI, aridity index; Ca_Exch, exchangeable Ca²⁺ content; Clay + silt, clay and silt content; Fe_o + Al_o, poorly crystalline Fe/Al oxide content; MAP, mean annual precipitation; MAT, mean annual air temperature.